US4708447A - Apparatus for the endless projection of a cinematographic film - Google Patents

Apparatus for the endless projection of a cinematographic film Download PDF

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Publication number
US4708447A
US4708447A US06/804,644 US80464485A US4708447A US 4708447 A US4708447 A US 4708447A US 80464485 A US80464485 A US 80464485A US 4708447 A US4708447 A US 4708447A
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United States
Prior art keywords
film
winding drum
film roll
winding
support rollers
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Expired - Fee Related
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US06/804,644
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English (en)
Inventor
Xaver Kuoni
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CET CONSTRUCTION ENGINEERING AND TECHNOLOGY Ltd ONE DUNRAVEN STREET LONDON W1Y 3FG GREAT BRITAIN A CORP OF GREAT BRITAIN
C E T CONSTRUCTION ENG G AND Tech Ltd
Original Assignee
C E T CONSTRUCTION ENG G AND Tech Ltd
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Publication date
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Assigned to C.E.T. CONSTRUCTION ENGINEERING AND TECHNOLOGY LIMITED, ONE DUNRAVEN STREET, LONDON W1Y 3FG, GREAT BRITAIN A CORP. OF GREAT BRITAIN reassignment C.E.T. CONSTRUCTION ENGINEERING AND TECHNOLOGY LIMITED, ONE DUNRAVEN STREET, LONDON W1Y 3FG, GREAT BRITAIN A CORP. OF GREAT BRITAIN ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: KUONI, XAVER
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/32—Details specially adapted for motion-picture projection

Definitions

  • the present invention relates to an apparatus for the endless projection of a cinematographic film, comprising a rotatably journalled table for axially supporting a spiral-like film roll, a winding drum coaxially arranged on the table and having an annular support body for radially supporting the innermost winding of the film roll, first guide rollers for continuously delivering the film from the innermost winding of the film roll for the purpose of feeding the film to a film projector, and further guide rollers for guiding the film coming back from the film projector to the outermost winding of the film roll.
  • a cinematographic film has a forward or leading end and a rear or trailing end.
  • a film is handled in form of a spiral-like film roll placed on a winding core or winding drum, one end of the film strip being releaseably fixed at the winding core or winding drum.
  • the film strip is drawn off from the outer periphery of the film roll as it is projected, then passed through the projector, and thereafter re-wound on a second winding core or winding drum. By doing so, the leading end of the film strip comes to lie at the inner periphery of the second film roll being formed. To allow another projection of the film, it is necessary to rewind the film strip before it can be projected again.
  • the apparatus comprises a rotatably journalled table for axially supporting a spiral-like film roll, a winding drum coaxially arranged on the table and having an annular support body for radially supporting an innermost winding of the film roll and for defining an interior space in the winding drum, first guide pulleys for continuously delivering the film from the innermost winding of the film roll for the purpose of feeding the film to a film projector, some of the first guide pulleys being located in the interior space of the winding drum, further guide pulleys for guiding the film coming back from the projector to an outermost winding of the film roll, a sprocket for the film transport located within the interior space of the winding drum; wherein the annular support body of the winding drum has an outer circumference mounting a plurality of pairs of support rollers which are freely rotatable on axles extending in parallel with an axis of the winding drum for frictionless radial supporting of the innermost winding of the film roll; where
  • FIG. 1 is a schematic side elevation view of a cinematographic projector and an apparatus according to the invention for the endless projection of motion-picture films;
  • FIG. 2 is a top plan view, in a larger scale, of a portion of the apparatus according to the invention.
  • FIG. 3 is a sectional view taken along the line 3--3 in FIG. 2, in even larger scale;
  • FIG. 4 shows a cross-section taken along the line 4--4 in FIG. 3;
  • FIG. 5 shows a similar cross-section taken along the line 5--5 in FIG. 3;
  • FIG. 6 is a sectional view taken along the line 6--6 in FIG. 2, in a larger scale
  • FIG. 7 shows a top plan view of a coupling ring having variable diameter, which is a part of the portion of the apparatus shown in FIG. 6;
  • FIG. 8 is a top plan view of a portion of the apparatus according
  • FIG. 9 is a cross-section taken along the line 9--9 in FIG. 8.
  • FIG. 10 illustrates a side elevation view of another portion of the apparatus according to FIG. 1, in a larger scale.
  • the apparatus 21 comprises a stationary frame 23 carrying a horizontal circular table 24 for supporting a spiral-like film roll 25.
  • the table is supported by an armature 26, which in turn is rotatably journalled on a gear box 27, as described later.
  • the gear box 27 accomodates an angle gear connected to an electric drive motor 28.
  • the latter does not serve to rotate the table 24, but to drive a shaft coaxially journalled within the armature 26, as will be explained later.
  • a second drive motor 29 is mounted on the frame 23.
  • the motor 29 is coupled with a vertical shaft 31, the upper end of which carries a friction wheel 32 bearing against a cylindrical rim 33 of the armature 26.
  • the frictional wheel 32 transmits its rotational movement to the armature 26 and the table 24.
  • a winding drum 34 is coaxially mounted, the winding drum serving to radially support the innermost winding of the film roll 25, as will be described below.
  • the top side of the table 24 is provided with a plurality of individually rotatable support rollers 40 and 41 for axially supporting the film roll 25 in a frictionless fashion.
  • Each of the support rollers 40 and 41 has a cylindrical peripheral surface and is rotatably journalled on an axle 42 or 43, respectively (FIGS. 3 to 5).
  • the support rollers 40 and 41 extend substantially in radial directions of the table 24, and the axial length of each support roller is a fraction only of the radial dimension of the table 24.
  • the support rollers 40 and 41 are arranged in larger groups 44 and smaller groups 45, all the support rollers forming such a group being arranged in two adjacent parallel arrays running in a radial direction of the table 24.
  • the support rollers 40 forming one of the parallel arrays are offset with respect of the support rollers 41 forming the other array, in axial direction by a distance smaller than the axial dimension of an individual support roller 40 or 41, so that the end portions of neighboured support rollers 40 and 41 of one and the other array overlap, as clearly shown in FIG. 2.
  • the support rollers 40 of one array bridge the gaps between the support rollers 41 of the other array, and vice versa.
  • the ends of the axles 42 and 43, on which the support rollers 40 and 41, respectively, are freely rotatable, are fixed in bores of bearing jaws 46.
  • the bearing jaws 46 belonging to a larger group of the support rollers are accomodated in a rail 47 of U-shaped cross-section, and spacers 48, 49 and 50, respectively, each having a U-shaped cross-section, are placed between the consecutive bearing jaws 46 within the rail 47.
  • the support rollers 40 and 41 forming the group 44 as well as the associated bearing jaws 46 and spacers 48, 49 and 50 are held together so as to form a structural unit which is mounted on the table 24 by means of bolts 51 and 52.
  • the support rollers 40 and 41 forming a smaller group 45 are arranged at a common rail 53 of U-shaped cross-section (FIG. 2) so as to form a structural unit mounted on the table 24 by means of bolts 54 and 55.
  • the larger groups 44 of support rollers 40 and 41 alternate with the smaller groups 45 in the circumferential direction of the table 24, and the ends of the rails 47 and 53 remote from the center 56 of the table have equal distances from the center.
  • an annular band 57 (FIGS. 2 and 3) runs around the rails 47 and 53 and is fixed to the outer ends thereof in a not shown manner.
  • the annular band 57 has an upper surface 58 lying in an imaginary horizontal plane comprising also the uppermost generatrics of every support rollers 40 and 41.
  • the winding drum 34 comprises a horizontal disk-shaped bottom 60 and an annular body 61 extending upwardly from the periphery of the bottom 60.
  • the outer peripheral surface of the annular body 61 is provided with a pair of parallel circumferential grooves 63, in each of which a plurality of support rollers 64 are arranged. Pairs of support rollers 64 in the upper and in the lower circumferential groove 63 are rotatably journalled on common vertical axles 65, as can best seen in FIG. 3.
  • the support rollers 64 extend beyond the outer peripheral surface of the annular body 61 and follow each other in circumferential direction of the annular body at sufficient small distances in order to prevent the innermost winding of the film roll 25 from contacting the annular body 61. Consequently, the innermost winding of the film roll 25 is radially supported by the rotatable support rollers 64 so that any friction between the winding drum 34 and the film roll 25 is eliminated.
  • a radially protuding rim 66 at the upper end of the annular body 61 serves to hold down some inner windings of the film roll onto the adjacent horizontal support rollers 40 at the table 24.
  • the winding drum 34 is independent of the table 24 and is located above a central opening 70 (FIG. 3) of the table. While the table 24 is immediately supported on the armature 26, as shown in FIG. 3, the bottom 60 of the winding drum 34 is mounted on a horizontal flange 71 of a central shaft 72 extending coaxially through the armature 26, as shown in FIG. 6.
  • the armature 26 in turn is rotatably journalled, by means of a double-row ball bearing 73, on a stationary support 74, the latter being mounted on the gear box 27 (FIG. 1).
  • the support 74 is provided with a central recess 75, in which a partially hollow shaft 76 is rotatably mounted by means of a pair of ball-bearings 77 and 78.
  • the lower end of the shaft 76 is operatively coupled with the drive motor (FIG. 1), via the angle gear in the gear box 27.
  • the before-mentioned shaft 72 which supports the winding drum 34, extends coaxially into the hollow shaft 76, the lower end portion of the shaft 72 being supported on the shaft 76 by means of a needle-bearing 79 and a trust-bearing 80.
  • a toothed wheel 81 is rotatably journalled on the shaft 72 by means of a pair of ball-bearings 82 and 83.
  • the toothed wheel 81 is fixedly connected to a bush 84 which surrounds the shaft 72 and extends into the hollow shaft 76.
  • One-way clutch devices for coupling the shaft 76 with the bush 84 for rotation in one sense only.
  • One-way clutch devices suitable for this purpose are generally known and available on the market, for example those manufactured by the Torrington Company, so that there is no need for a detailed description thereof.
  • a special coupling ring 93 is arranged between an outer circumferential surface 90 of the support 74 and an inner circumferential surface 91 of the armature 26.
  • the coupling ring 93 is provided with a throughgoing slit 94, the shape of which is so that two overlapping end portions 93A and 93B are formed.
  • Each one of the end portions has a bore 95 or 96, respectively.
  • a further bore 97 is made in the coupling ring 93 at a location diametrically opposite to the slit 94.
  • a support pin 100 is fixed by means of a bolt 101 at the lower side of the bottom 60 of the winding drum 34.
  • a portion 102 of the support pin 100 engages the bore 97 of the coupling ring 93, and a radially elastic securing ring 103 holds the coupling ring in position on the support pin 100.
  • a pair of bolts 105 and 106 each of which has a cylindrical portion extending into the bore 95 or 96, respectively, of the coupling ring 93, are fixed at a common rotary member 107. The latter is connected, by means of a bolt 108, to a rotary cylinder 109, which in turn is rotatably journalled in a bush 110 attached to the lower side of the bottom 60 of the winding drum 34.
  • the upper axial end portion of the rotary cylinder 109 extends through a suitable opening in the bottom 60 and is provided with a freely accessible recess 111 of non-circular shape (see also FIG. 2).
  • the recess 111 is intended to receive a key (not shown) for turning the rotary cylinder 109 and rotary member 107 in the bush 110 in order to increase or decrease the diameter of the coupling ring 93.
  • the annual body 61 of the winding drum 34 is provided at a location along its periphery with a substantially radial slit 120, through which the innermost winding of the film roll 25 can be fed into the inner space of the winding drum 34.
  • a plurality of further guide pulleys 123 to 126 for the film strip 22 are mounted for free rotation on associated vertical axles 127 to 130 within the winding drums 34, these axles being fixed to the bottom 60 of the winding drum.
  • a sprocket 131 for the feed motion of the film strip 22 is seated on a vertical shaft 132.
  • the shaft 132 is rotatably journalled by means of ball-bearings 133 in a bearing bush 134 fixed to the bottom 60 of the winding drum 34, only one of the ball-bearings 133 being visible in FIG. 6.
  • the lower end of the shaft 132 carries a toothed wheel 135 which is operatively coupled with the before-mentioned toothed wheel 81 by means of a toothed belt 136 running below the bottom 60 of the winding drum 34, as schematically indicated in FIG. 6.
  • a pressure roller 138 Associated with the sprocket 131 is a pressure roller 138 (FIG.
  • FIG. 1 shows how the film strip 22 is fed from the winding drum 34 to the projector 20.
  • Some guide pulleys 151 to 154 having horizontal axes are rotatably mounted on an upstanding extension 150 of the frame 23.
  • a carriage or sled 155 is movable in vertical directions along the extension 150.
  • a further guide pulley 156 having a horizontal axis is rotatably mounted on the carriage or sled 155.
  • Under the action of the gravity or a spring (not shown) the carriage or sled 155 has the tendency to move downward, whereby the portion of the film strip 22 running between the sprocket 131 in the winding drum 34 and an upper sprocket 157 of the projector 20 is tensioned by a given tension force.
  • the upstanding extension 150 carries a pair of end switches 158 and 159 which are actuatable by the carriage or sled 155 when the latter reaches the upper or lower end of the allowed path of movement, respectively.
  • the end switches 158 and 159 are connected to an electrical control device 160 for adjusting the speed of the motor 28 for driving the sprocket 131 in the winding drum 34.
  • a hold-down roller 170 (FIGS. 1 and 10) is provided at the location where the film strip 22 coming back from the projector 20 tangentially meets the outer winding of the film roll 25.
  • the hold-down roller 170 is rotatably journalled on an axle 171 which is oriented about radially to the table 24 and mounted on a rocker arm 172.
  • the latter is pivotally mounted at a horizontal crossrail 173, which in turn is fixed at the upstanding extension 150 of the frame 23 by means of a support 174 (FIG. 10).
  • the rocker arm 172 can be moved along the crossrail 173 in order to adjust the position of the hold-down roller 170 with respect to the diameter of the film roll 25.
  • the second motor 29 which serves to drive the armature 26 and the table 24 is connected to another electrical control device 175 for adjusting the speed of the motor 29.
  • the speed of the motor 29 is advantageously adjusted in such a manner that the angular speed of the table 24 is within a range limited by the angular speeds of the outermost and the innermost windings of the film roll 25.
  • a device 180 for controlling the compactness of the film roll 25.
  • This device 180 comprises a carrying plate 181 rigidly mounted on the frame 23.
  • a cantilever arm consisting of three parallel rods 182 and an end plate 183 is fixed to the carrying plate 181 so as to extend about radially to the table 24 from the outer periphery thereof toward the winding drum 34.
  • Parallel to the rods 182 is arranged a shaft 184 which is rotatably journalled in the plates 181 and 183.
  • the end portion of the shaft 184 remote from the winding drum 34 carries a toothed wheel 185 which, by means of a toothed belt 186, is coupled with a further toothed wheel 187.
  • the toothed wheel 187 Via an angle gear housed in a gear box 188, the toothed wheel 187 is operatively coupled with a friction wheel 189 lying against the outer periphery of the table 24 so as to be rotated when the table 24 is turned.
  • the shaft 184 passes through a toothed wheel 190 which is displaceable along the shaft 184 while constantly being coupled therewith for rotation.
  • the toothed wheel 190 is located between a pair of straps 191 and 192 pivotally and displaceably mounted on the shaft 184 and interconnected by a stud 193.
  • the two wheels 190 and 195 are operatively coupled.
  • One, 191, of the pair of straps comprises an extension 198 slightly bent upward and provided with a weight 199, so that under the influence of the gravity the straps 191 and 192 have the tendency to pivot downward.
  • the structural unit consisting of the elements 190 to 199 is adjusted along the shaft 184 in such a manner that the friction wheel 196 is lying on some outermost windings of the film roll 25.
  • the film roll 25 must be build up on the table 24.
  • the winding drum 34 is firmly coupled with the armature 26 by means of the coupling ring 93 (FIG. 6).
  • the rotary cylinder 109 and the rotary member 107 fixed thereto are turned counterclockwise by means of a key (not shown) introduced into the recess 111 of the cylinder 109, thus causing a spreading of the coupling ring 93 and an increase of its diameter.
  • the leading end of the film 22 is put through the slit 120 of the annular ring 61 of the winding drum 34, as indicated by an arrow 143 in FIG.
  • the winding drum 34 For the endless projection of the film 22, the winding drum 34 must be uncoupled from the armature 26 and firmly coupled with the stationary support 74. To this end, the rotary cylinder 109 and the rotary member 107 are turned clockwise by means of the before-mentioned key, thus causing a decrease of the diamter of the coupling ring 93. The leading end portion of the film 22 is then laid around the guide pulleys 122 and 123, around the sprocket 131 and around the various guide pulleys 124, 125, 126 and 140 as indicated by dotted lines in FIG. 2.
  • the projector 20 and the two drive motors 28 and 29 are simultaneously switched on.
  • the motor 28 drives the shaft 76 (FIG. 6) and via the now operative one-way clutch 85 the bush 84 and the toothed wheel 81 connected thereto.
  • the toothed belt 136 By means of the toothed wheel 135 and the shaft 132 as well as the sprocket 131 are also driven anti-clockwise in FIG. 2.
  • the rotating sprocket 131 moves the film strip through the slit 120 in the annular body 61 of the winding drum 34, whereby the film is continously drawn off from the film roll 25.
  • the speed of the motor 28 is automatically adjusted so that the film feed caused by the sprocket 131 is equal to the film speed through the projecctor 20.
  • the innermost winding of the film roll runs frictionless over the support rollers 64 at the annular body 61, so that the occurence of scratches and scrapes in the emulsion of the film due to friction is practically precluded.
  • the other windings of the film roll 25 move around the winding drum 34, in counterclockwise direction in FIG. 2. This rotation of the whole film roll 25 is favored by the rotation of the table 24 in the same sense. Thus, excessive tensional stress in the film strip is avoided.
  • the running speed of the film is all the same in every winding of the film roll 25.
  • the speed of the drive motor 29 is set to a value, by means of the control device 175, so that the angular speed of the table 24 is substantially equal to the arithmetic mean value of the angular speeds of the innermost and the outermost windings of the film roll 25.
  • each support roller 40 or 41 is short in comparison with the radial dial dimension of the film roll 25, the windings of the film roll lying on one and the same support roller do not have significantly different angular speeds. Thus, also the friction between the windings and the support rollers are very low.
  • the hold-down roller 170 lying on some outer windings of the film roll 25 under the influence of the gravity ensures that the film portion continuously running back from the projector 20 is brought into contact with the support rollers 40 and 41 of the table 24, so that the edges of the film in the various windings of the film roll 25 are maintained in alignement.
  • the friction wheel 196 excerts a given braking action on the outermost winding of the film roll 25, with the effect that all the windings of the film roll are permanently in contact one with another by a certain minor pressure.
  • the occurence of a partly too loose film roll in which possibly unnecessary great differencies in the angular speed of consecutive or neighboured windings could be noted, is effectively precluded.
  • the film roll 25 surrounding the winding drum 34 and axially supported by the table 24 is continuously reduced at its inner periphery and simultaneously continuously built up at its outer periphery, while the inner and outer diameters remain constant.
  • the hold-down roller 170 and the friction wheel 196 can be swung upward in inoperative positions, in which they do no longer contact the film roll 25.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Winding Of Webs (AREA)
  • Pinball Game Machines (AREA)
  • Display Devices Of Pinball Game Machines (AREA)
  • Projection Apparatus (AREA)
US06/804,644 1984-03-19 1985-03-19 Apparatus for the endless projection of a cinematographic film Expired - Fee Related US4708447A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH1375/84A CH662892A5 (de) 1984-03-19 1984-03-19 Einrichtung fuer die endlosprojektion eines kinematographischen filmes.
CH1375/84 1984-03-19

Publications (1)

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US4708447A true US4708447A (en) 1987-11-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
US06/804,644 Expired - Fee Related US4708447A (en) 1984-03-19 1985-03-19 Apparatus for the endless projection of a cinematographic film

Country Status (9)

Country Link
US (1) US4708447A (fr)
EP (1) EP0155998A1 (fr)
CA (1) CA1264337A (fr)
CH (1) CH662892A5 (fr)
DK (1) DK121885A (fr)
ES (1) ES8608187A1 (fr)
FI (1) FI851048L (fr)
NO (1) NO850744L (fr)
WO (1) WO1985004263A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4836463A (en) * 1986-12-01 1989-06-06 Christie Electric Corporation Endless loop transport and storage system
US4903906A (en) * 1987-11-13 1990-02-27 Christie Electric Corp. Endless loop transport and storage system
US5189451A (en) * 1992-01-08 1993-02-23 Bredin Robert C Platter feed safety

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1279762A (en) * 1916-07-27 1918-09-24 Monte London Film-carrier.
US1631137A (en) * 1924-06-11 1927-06-07 Charles I Link Film-feeding apparatus
US1639469A (en) * 1924-07-31 1927-08-16 Harry S Merritt Film support for motion-picture-projecting machines
US2273274A (en) * 1938-12-19 1942-02-17 George D Krouse Film magazine
US2740628A (en) * 1951-07-14 1956-04-03 James W Small Continuous film feed means for amotion picture projector unit
FR1197500A (fr) * 1958-07-01 1959-12-01 Etoile Film Perfectionnement aux systèmes de déroulement continu d'un film alimentant les appareils de projections cinématographiques ou autres
GB1134814A (en) * 1965-02-23 1968-11-27 Hideya Kobayashi Improvements in or relating to a means for running an endless belt

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1279762A (en) * 1916-07-27 1918-09-24 Monte London Film-carrier.
US1631137A (en) * 1924-06-11 1927-06-07 Charles I Link Film-feeding apparatus
US1639469A (en) * 1924-07-31 1927-08-16 Harry S Merritt Film support for motion-picture-projecting machines
US2273274A (en) * 1938-12-19 1942-02-17 George D Krouse Film magazine
US2740628A (en) * 1951-07-14 1956-04-03 James W Small Continuous film feed means for amotion picture projector unit
FR1197500A (fr) * 1958-07-01 1959-12-01 Etoile Film Perfectionnement aux systèmes de déroulement continu d'un film alimentant les appareils de projections cinématographiques ou autres
GB1134814A (en) * 1965-02-23 1968-11-27 Hideya Kobayashi Improvements in or relating to a means for running an endless belt

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4836463A (en) * 1986-12-01 1989-06-06 Christie Electric Corporation Endless loop transport and storage system
US4903906A (en) * 1987-11-13 1990-02-27 Christie Electric Corp. Endless loop transport and storage system
US5189451A (en) * 1992-01-08 1993-02-23 Bredin Robert C Platter feed safety

Also Published As

Publication number Publication date
CA1264337A (fr) 1990-01-09
ES8608187A1 (es) 1986-06-01
WO1985004263A1 (fr) 1985-09-26
DK121885A (da) 1985-09-20
DK121885D0 (da) 1985-03-18
ES540672A0 (es) 1986-06-01
NO850744L (no) 1985-09-20
FI851048A0 (fi) 1985-03-15
CH662892A5 (de) 1987-10-30
EP0155998A1 (fr) 1985-10-02
FI851048L (fi) 1985-09-20

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